2.To determine that smoke is capable of entering the sens- ing chamber, a visual examination should be conducted to note any obscurations around the sensing chamber. If a smoke test is required, smoke such as cigarette, cot- ton wick, or punk smoke may be blown directly at the smoke detector head. It is important to plug the exhaust and sampling tube hole to prevent ducted air from blow- ing smoke away from the smoke detector head. Record all test records in the Detector Test Log (page 12).
CAUTION
Remember to remove the plugs after this test or the detec- tor will not sense smoke in the air duct.
7.2 Alarm Tests
Before replacing the duct housing cover, the detector interconnections should be checked. The DH500 may be checked as follows:
A.
1.Make sure power is applied to the detector.
2.Place the painted surface of the test magnet against the housing next to the rib molded onto the outside of the housing (see Figure 7).
3.The LEDs on the detector should latch on as should any accessories (i.e. RA400ZA, RTS451), and the alarm condition should be verified at the control panel.
Figure 7. Testing detector
Figure 8. Detector head removal:
DETECTOR
HEAD
TWIST
COUNTERCLOCKWISE
TO REMOVE
DUCT
HOUSING
TWIST
CLOCKWISE
TO INSTALL
B. RTS451/RTS451KEY Remote Test Station
The RTS451/RTS451KEY Remote Test Station facilitates test of the alarm capability of the duct detector as indicated in the RTS451/RTS451KEY manual. The DH500 duct detector cannot be reset by the RTS451/RTS451KEY. It must be reset at the system control panel.
To install the RTS451/RTS451KEY test coil, connect the device as shown in Figure 9; wire runs must be limited to 25 ohms or less per interconnecting wire. Place the coil in the detector housing with the arrow facing up and pointing toward the detector as in Figure 9. Attach the coil leads to the housing terminals as shown; polarity is not important. Firmly screw the bracket in place over the test coil.
DUCT DETECTOR HOUSING
TEST 
MAGNET | MOLDED RIB |
PAINTED SIDE
TOWARD HOUSING
DETECTOR
HEAD
7.3 MOD400 Sensitivity Test
After verification of alarm capability, the MOD400 test module may be used with a voltmeter to check detector sensitivity as indicated in the MOD400 installation manual. The housing cover must be removed to perform this test.
If the MOD400 readings indicate that the detector head is outside of the acceptable range, the detector head requires cleaning. (See Periodic Maintenance Requirements on page 9.)
7.4 Trouble Test
The capability of “TROUBLE” detection is tested by remov- ing the detector head from the duct housing. The detector head is removed by turning it counterclockwise about 10 degrees (Figure 8). The system control panel should indi- cate a trouble condition. Reinserting the detector head should clear the trouble condition.
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